Today I noticed hundreds of little brown bugs shaped like ants(multiple legs and body split into 2-3 parts)that sit right above the water line. None have gone under the water. They are brown and jump when I try to wipe them up but are not flea shaped and under a magnifying glass they have 2 antennas and around 6 legs. And they are very very tiny my husband can't see them but I can. Any help? What are they?